Observation of velocity overshoot in silicon inversion layers

Employing a test structure, velocity overshoot in silicon inversion layers is observed at room temperature. For channel lengths longer than 0.3 mu m, the velocity/field relation follows the well-known behavior with no channel length dependence. The first indication of velocity overshoot is seen at a channel length of 0.22 mu m, while at L=0.12 mu m, drift velocities up to 35% larger than the long-channel value are measured.<>